Mitsubishi Electric PURY-P72 Service Handbook page 232

[ IX Troubleshooting ]
1. Error Code
4220
4225 (YKMU-A)
4226
Logic error (Detail code 111)
2. Error definition and error detection method
H/W error
If only the H/W error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
In the case of 4220
(1) External noise
(2) INV board failure
In the case of 4225 and 4226
(1) External noise
(2) Fan board failure
Refer to section -7- "Inverter (YKMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 321)
1. Error Code
4220
4225
4226
Low bus voltage at startup (Detail code 131)
2. Error definition and error detection method
When Vdc 160 V is detected just before the inverter operation.
3. Cause, check method and remedy
(1) Inverter main circuit failure
Same as detail code 108 of 4220 error
Refer to section -7- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 310)(page 321)
HWE1116D
Cause
Cause
- 223 -
Check method and remedy
Refer to IX [4] -7- (2) [1].(page 323)
Check method and remedy
Refer to IX [4] -7- (2) [6], [7], [8].(page 325)
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